Copper(I)‐Catalyzed Enantioconvergent Borylation of Racemic Benzyl Chlorides Enabled by Quadrant‐by‐Quadrant Structure Modification of Chiral Bisphosphine Ligands
作者:Hiroaki Iwamoto、Kohei Endo、Yu Ozawa、Yuta Watanabe、Koji Kubota、Tsuneo Imamoto、Hajime Ito
DOI:10.1002/anie.201906011
日期:2019.8.5
The first copper(I)‐catalyzed enantioselective borylation of racemic benzyl chlorides has been realized by a quadrant‐by‐quadrant structure modulation of QuinoxP*‐type bisphosphine ligands. This reaction converts racemic mixtures of secondary benzyl chlorides into the corresponding chiral benzylboronates with high enantioselectivity (up to 92 % ee). The results of mechanistic studies suggest the formation
Palladium-catalyzed carbonylative coupling of (chloromethyl)arenes with terminal arylalkynes to produce 1,4-diaryl-3-butyn-2-ones
作者:Xiujuan Feng、Jiliang Song、Hesong Liu、Liangguang Wang、Xiaoqiang Yu、Ming Bao
DOI:10.1039/c3ra42972e
日期:——
A convenient and efficient method for the synthesis of 1,4-diaryl-3-butyn-2-ones is described. The carbonylative coupling reactions of (chloromethyl)arenes with terminal arylalkynes proceeded smoothly in the presence of a PdCl2(PPh3)2 catalyst under mild reaction conditions to produce the corresponding 1,4-diaryl-3-butyn-2-ones in satisfactory to excellent yields.
Nickel-Catalyzed Enantioconvergent Borylation of Racemic Secondary Benzylic Electrophiles
作者:Zhaobin Wang、Shoshana Bachman、Alexander S. Dudnik、Gregory C. Fu
DOI:10.1002/anie.201806015
日期:2018.10.26
been reports of the application of chiral nickel catalysts to the corresponding reactions with heteroatom nucleophiles to produce carbon–heteroatom bonds with good enantioselectivity. Herein, we establish that a chiral nickel/pybox catalyst can borylate racemic secondary benzylic chlorides to provide enantioenriched benzylic boronic esters, a highly useful family of compounds in organic synthesis.